How to design PTFE lined butterfly valve?

Fully PTFE lined butterfly valves engineered for bidirectional zero leakage shutoff in demanding corrosive and ultra-pure industrial applications. Our PTFE lined butterfly valves offer unsurpassed resistance to corrosion, permeation and microbial contamination for maximum purity and reliability with minimal maintenance. Engineered for bidirectional zero leakage shutoff, PTFE lined butterfly valves are the high performance solution for critical applications.

How to design PTFE lined butterfly valve?

Why choose PTFE lined butterfly valve for oil and gas applications?

What are the environmental factors for selecting PTFE lined butterfly valves?

How to design PTFE lined butterfly valve?

The PTFE lined butterfly valve design elements consist of only four main components, that are, body, disc, stem/shaft and seat. Actuator selection is also an important factor. Within each of these elements are the variations of material and designs that adapt the PTFE lined butterfly valve to the intended service. Understanding the importance and features of the design elements is key to matching the PTFE lined butterfly valve to the intended service.

Body: PTFE lined butterfly valves generally have bodies that fit between two pipe flanges. The most common body designs are lug and wafer.

Rotating disk: The flow closure member of a PTFE lined butterfly valve is the disk. A PTFE lined butterfly valve is a flow control device that incorporates a rotational disk to control the flowing media in a process. The disk is always in the passageway, but because it is relatively thin, it offers little resistance to flow.

Stem: The stem of the PTFE lined butterfly valve may be a one-piece shaft or a two-piece design.

Seat: Since the disc in a PTFE lined butterfly valve is fully supported by the shaft and its bearings, the seat is required only to perform a sealing function, not a strong supporting function, as is common with most ball valve designs.

Why choose PTFE lined butterfly valve for oil and gas applications?

Operating conditions for PTFE lined butterfly valves deployed within the oil and gas industry are uniquely challenging. Extreme environments can range from temperatures exceeding 816°C to pressure greater than 25,000 psi and cryogenic environments for LNG down to -162°C. Taking all of that into account, as well as the often remote locations involved, PTFE lined butterfly valves need to perform dependably.

In the upstream, PTFE lined butterfly valves control the flow of crude oil and natural gas and are required to perform throughout a well’s years of operation. In the midstream, the storage and transportation of oil and gas from remote locations requires long pipelines serviced by PTFE lined butterfly valves that can protect equipment and maximize flow. In the downstream, PTFE lined butterfly valves need to handle the high pressure, high-temperature conditions associated with refineries, which includes the refinement of crude oil and the delivery of petroleum-based products.

What are the environment factors for selecting PTFE lined butterfly valve?

External corrosion can be controlled through selection of corrosion resistant body materials or coatings. Another external factor is the pipeline insulating. The neck on the PTFE lined butterfly valve needs to be long enough for the operator to clear the insulation on the mating flanges.

The shaft or stem in a PTFE lined butterfly valve is the structural element that unites the disc and body. It also provides the means for applying torque to position the disc of PTFE lined butterfly valve. The connections between the stem and the operator and between the stem and the disc are crucial elements in the selection of a PTFE lined butterfly valve. A build-up of tolerances in these connections causes the disc movement to lag the operator movement. This prevents precise positioning of the disc or it may allow the disc to flutter into premature failure. Precisely machined fits between the stem and disc are important.

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